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An ASKAP Search for a Radio Counterpart to the First High-significance Neutron Star–Black Hole Merger LIGO/Virgo S190814bv

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [4];  [6];  [8];  [7];  [7];  [9];  [10];  [11];  [7];  [7];  [7];  [4];  [9] more »;  [5];  [12];  [13];  [14];  [2];  [5];  [7];  [15];  [4];  [16] « less
  1. Univ. of Sydney, NSW (Australia). Sydney Inst. for Astronomy; Commonwealth Scientific and Industrial Research Organization (CSIRO) Astronomy and Space Science, Epping, NSW (Australia). Australia Telescope National Facility; ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Hawthorn, VIC (Australia)
  2. Univ. of Sydney, NSW (Australia). Sydney Inst. for Astronomy
  3. Univ. of Sydney, NSW (Australia). Sydney Inst. for Astronomy; ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Hawthorn, VIC (Australia)
  4. Commonwealth Scientific and Industrial Research Organization (CSIRO) Astronomy and Space Science, Epping, NSW (Australia). Australia Telescope National Facility
  5. Univ. of Sydney, NSW (Australia). Sydney Inst. for Astronomy; Commonwealth Scientific and Industrial Research Organization (CSIRO) Astronomy and Space Science, Epping, NSW (Australia). Australia Telescope National Facility
  6. Univ. of Wisconsin, Madison, WI (United States). Center for Gravitation, Cosmology, and Astrophysics
  7. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  8. Texas Tech Univ., Lubbock, TX (United States)
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy & Astrophysics
  10. Commonwealth Scientific and Industrial Research Organization (CSIRO) Astronomy and Space Science, Bentley, WA (Australia). Australia Telescope National Facility
  11. Princeton Univ., NJ (United States); Univ. of Tokyo (Japan)
  12. Univ. of Pittsburgh, PA (United States); Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), Pittsburgh, PA (United States)
  13. Liverpool John Moores Univ., Liverpool (United Kingdom)
  14. California Inst. of Technology (CalTech), Pasadena, CA (United States). Infrared Processing and Analysis Center (IPAC)
  15. Univ. of Maryland, College Park, MD (United States)
  16. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
We present results from a search for a radio transient associated with the LIGO/Virgo source S190814bv, a likely neutron star–black hole (NSBH) merger, with the Australian Square Kilometre Array Pathfinder. We imaged a 30 deg2 field at ΔT = 2, 9, and 33 days post-merger at a frequency of 944 MHz, comparing them to reference images from the Rapid ASKAP Continuum Survey observed 110 days prior to the event. Each epoch of our observations covers 89% of the LIGO/Virgo localization region. We conducted an untargeted search for radio transients in this field, resulting in 21 candidates. For one of these, AT2019osy, we performed multiwavelength follow-up and ultimately ruled out the association with S190814bv. All other candidates are likely unrelated variables, but we cannot conclusively rule them out. We discuss our results in the context of model predictions for radio emission from NSBH mergers and place constrains on the circum-merger density and inclination angle of the merger. This survey is simultaneously the first large-scale radio follow-up of an NSBH merger, and the most sensitive widefield radio transients search to-date.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Australian Government; National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1603560
Journal Information:
The Astrophysical Journal. Letters (Online), Journal Name: The Astrophysical Journal. Letters (Online) Journal Issue: 1 Vol. 887; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Gravitational waves from spinning black hole-neutron star binaries: dependence on black hole spins and on neutron star equations of state text January 2011
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Black Hole-Neutron Star Mergers: Disk Mass Predictions text January 2012
Mass ejection from neutron star mergers: different components and expected radio signals text January 2015
The LOFAR Transients Pipeline preprint January 2015
A pilot ASKAP survey of radio transient events in the region around the intermittent pulsar PSR J1107-5907 text January 2015
Radio Counterparts of Compact Binary Mergers detectable in Gravitational Waves: A Simulation for an Optimized Survey text January 2016
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Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event text January 2017
A turnover in the radio light curve of GW170817 text January 2018
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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Gravitational waves
Radio astronomy
Radio transient sources
Transient sources